'Black Swan' and 'The King's Speech' lead SAG nominations

'Black Swan' and 'The King's Speech' lead the nomination for this year's 17th annual Screen Actors Guild (SAG) Awards.

The psychological thriller, which stars Natalie Portman as a ballet dancer experiencing a mental trauma, and the Tom Hooper-directed drama starring Colin Firth as Britain's King George VI both received nominations in four categories, including Best Cast in a Motion Picture and Leading Actor for the main stars.